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    Subject[PATCH 4.19 182/247] Input: raydium_ts_i2c - do not send zero length
    Date
    From: jeffrey.lin <jeffrey.lin@rad-ic.com>

    commit fafd320ae51b9c72d371585b2501f86640ea7b7d upstream.

    Add default write command package to prevent i2c quirk error of zero
    data length as Raydium touch firmware update is executed.

    Signed-off-by: jeffrey.lin <jeffrey.lin@rad-ic.com>
    Link: https://lore.kernel.org/r/1608031217-7247-1-git-send-email-jeffrey.lin@raydium.corp-partner.google.com
    Cc: stable@vger.kernel.org
    Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/input/touchscreen/raydium_i2c_ts.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    --- a/drivers/input/touchscreen/raydium_i2c_ts.c
    +++ b/drivers/input/touchscreen/raydium_i2c_ts.c
    @@ -419,6 +419,7 @@ static int raydium_i2c_write_object(stru
    enum raydium_bl_ack state)
    {
    int error;
    + static const u8 cmd[] = { 0xFF, 0x39 };

    error = raydium_i2c_send(client, RM_CMD_BOOT_WRT, data, len);
    if (error) {
    @@ -427,7 +428,7 @@ static int raydium_i2c_write_object(stru
    return error;
    }

    - error = raydium_i2c_send(client, RM_CMD_BOOT_ACK, NULL, 0);
    + error = raydium_i2c_send(client, RM_CMD_BOOT_ACK, cmd, sizeof(cmd));
    if (error) {
    dev_err(&client->dev, "Ack obj command failed: %d\n", error);
    return error;

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